Adjustable dumbbell and its use method

ABSTRACT

The invention relates to an adjustable dumbbell and its use method. The dumbbell comprises a base and a dumbbell body, the dumbbell body comprises a handle and a bell piece, the handle is a combination of a central shaft and a handle sleeve, the handle is also connected with an indexing plate, a gear piece and a bell piece box, the ends on both sides of the central shaft are provided with a snap ring groove and a gear step from the outside to the inside, and the indexing plate is provided with a lock The bell box is connected with a bell box cover, the bell box cover is connected with a locking leaf spring and a steel ball spring, the locking leaf spring is connected with a locking leaf, and the steel ball spring is connected with a steel ball.

CROSS-REFERENCE TO RELATED APPLICATIONS

This Application is a national stage application of PCT/CN2021/083687.This application claims priorities from PCT Application No.PCT/CN2021/083687, filed Mar. 29, 2021, and from the Chinese patentapplication 202010660333.2 filed Jul. 10, 2020, the content of which areincorporated herein in the entirety by reference.

TECHNICAL FIELD

The invention relates to the dumbbell technical field, in particular toan adjustable dumbbell and a use method thereof.

BACKGROUND

Dumbbell is a kind of auxiliary equipment for weight lifting and fitnessexercise. It has simple structure and easy to use. It can be used formuscle strength training and muscle compound action training.

At present, there are two kinds of dumbbells in the market: fixed weightand adjustable weight. The dumbbell with fixed weight is mainly made ofpig iron, with iron bars in the middle and solid balls at both ends.With the increase of exercise intensity of users, it is necessary topurchase and replace dumbbells of different weights, which undoubtedlyincreases the cost. The weight adjustable dumbbell is similar to thereduced barbell. In weight lifting or fitness exercise, the weight canbe increased or decreased by putting round iron pieces with differentweights on both ends of the short iron bar. However, the dumbbell piecesneed to be removed manually with the help of spanner and other tools,and the adjusted weight also needs to be calculated manually, which istroublesome and inconvenient to use.

The Chinese patent (CN110665168a) discloses a weight adjustabledumbbell, which includes a rod body. The two ends of the rod body aresymmetrically provided with an annular cavity, the annular cavity issurrounded by a side rod, the side rod extends out of the annularcavity, the annular cavity is provided with a spring, one end of thespring contacts with the inner wall of the annular cavity, the other endis provided with an annular washer, and the end of the side rod isconnected with the inner wall of the annular cavity The outer end isprovided with a pin body, between the pin body and the annular washer isprovided with a dumbbell piece sheathed on the side bar, one side of thedumbbell piece contacts with the annular washer, and the other sidecontacts with the pin body. Compared with the prior art, the inventionhas the advantages of adjustable weight and stable fixation. It has highpractical value and commercial value. However, the invention also hasthe disadvantages of manual rotation to adjust the weight, the weight onboth sides of the dumbbell can not be controlled and balanced, and thescale can not be visually displayed.

Based on this, it is necessary to design a weight adjustable dumbbell,which can solve the problems of manual removal of the bell piece, suchas inconvenient operation, uncontrollable weight, non intuitive weightdisplay, poor safety and so on.

SUMMARY

The purpose of the invention is to provide an adjustable dumbbell aimingat the shortcomings of the prior art, which can automatically select theweight to be used according to the different angles of the handlerotation, has simple structure and convenient operation, can intuitivelydisplay the scale of weight adjustment, control the weight balance, canavoid the accident of bell falling due to unreliable locking, andimproves the safety.

In order to achieve the above purpose, the invention provides thefollowing technical scheme: an adjustable dumbbell includes a base and adumbbell body, the dumbbell body includes a handle and a bell piece, thehandle is a combination of a central shaft and a handle sleeve, thehandle is also connected with an indexing plate, a gear piece and a bellpiece box, and the ends on both sides of the central shaft are providedwith a snap spring groove and a gear step from the outside to theinside, The dividing disc is provided with a lock piece positioninggroove and a steel ball shift hole, the bell piece box is connected witha bell piece box cover, the bell piece box cover is connected with alock piece spring and a steel ball spring, the lock piece spring isconnected with a lock piece, the lock piece is connected with a steelpin, and the steel ball spring is connected with a steel ball.

Preferably, there is a partition wall with the same spacing distance inthe middle of the bell slot, so that each bell is placed at the samedistance. When the bell is placed naturally, it can stay at the samevertical angle with the same opening direction without adjustment.

Preferably, the handlebar sleeve is a hollow cylinder with a largesemicircle hole, which can be directly die cast on the central shaft, orthe prepared hollow cylinder with a large semicircle hole in the centercan be sheathed on the central shaft to prevent the handlebar sleevefrom sliding with the central shaft at the same time.

Preferably, the central shaft is rod-shaped, and its cross section islarge semicircle, that is, a circle is cut off, and the snap ring grooveis a circle of depression on the central shaft.

Preferably, the gear step comprises N steps, n is a natural numbergreater than or equal to 2, N steps are notches on the central axis, thenotch depth of the first step is the shallowest and deepens in turn, andthe N steps are arranged clockwise or counterclockwise in turn, thestarting position of the N steps on the outer side of the central axisis the same, and the length of the first step is the shortest in themiddle direction of the central axis It is the longest and shortened inturn.

Preferably, the dividing disc is a circular plate with a notch, in whichthe radius of one part of the circle is slightly larger than that of theother parts, and is connected with the central axis through a snap ringgroove and a large semicircle dividing disc limit hole in the center ofthe dividing disc, the locking plate positioning groove is a grooveuniformly distributed on the periphery of the large semicircle of thesmaller radius part of the dividing disc, and the steel ball shift holeis uniformly distributed on the inner side of the dividing disc Thenumber of the positioning slots of the locking plate is n+1, whichincludes a starting gear, and the heights of the two sides of thestarting gear and the maximum gear are not consistent, which has thepositioning function; the number of the large semicircles of the steelball position holes located in the smaller radius part is equal to thenumber of the steps with different rotation angles on the positionsteps, and the steel ball position holes are one-to-one corresponding tothe position steps.

Preferably, the gear plate is a circle, and the positioning structure ofthe central axis is a large semicircle type limit hole in the center ofthe gear plate. The surface of the gear plate contains a gear mark, andthe gear mark is a number, which is consistent with the number oflocking plate positioning slots of the dividing disc. Except for theminimum gear mark, the gear mark corresponds to the gear step one byone.

Preferably, the gear identification can be hidden, and only onecorresponding weight gear identification is displayed each time theweight is adjusted.

Preferably, the bell piece is a large semicircle with a flat bottom, theinternal control semicircle hole is located at the intersection of thepositioning opening and the center of the bell piece, the controlsemicircle hole can make the handle pass through, and the flat bottomhas the orientation function, so that the bell piece is always in aunified opening direction in the bell piece groove.

Preferably, the bell box is an elliptic cylinder, and is provided with apartition wall for fixing the bell pieces with equal distance. One sideof the elliptic column is provided with a semicircle hole of the bellbox, and the semicircle hole of the bell box and the control semicircleof the bell can be connected through the gear step.

Preferably, the bell box is also provided with a bell box cover, thebell box cover is a cylinder, a plurality of holes for connecting thesnap spring groove, the lock spring and the steel ball spring arearranged inside the bell box cover, a baffle is also arranged on thecollar box cover, and the baffle is connected with the central shaftthrough the snap spring groove.

The use process of the invention is:

1. When the dumbbell body is placed on the base, the unlocking devicegives the locking spring a thrust, which makes the locking plateseparate from the positioning groove of the indexing plate lock plate,and the device is in the unlocking state.

2. When rotating the handle, the gear step can rotate through the bellplate and bell slot to different angles, and the weight of dumbbelllifting can be selected randomly.

3. When rotating the handle, the ball spring can drive the ball torotate on the indexing plate and fall into the ball gear hole, and cansimultaneously locate the corresponding gear step on the central shaftto realize the function of gear adjustment and locking.

4. When the handle is rotated, the text mark on the gear piece shows theweight of the bell plate during gear adjustment and locking.

5. When the proper weight is selected, the dumbbell is lifted, the forceof unlocking device to the spring of the lock plate disappears, thelocking plate is inserted into the locating groove of the locking plate,and the indexing plate, bell box and gear plate enter the locking state.

Compared with the prior art, the invention has a beneficial technicaleffect:

1. The invention uses the unlocking device to increase the thrust to thelocking spring, realizes the lock and unlocking of the dumbbell body,and has simple structure, convenient and quick;

2. The lock plate is used to control the rotation of dumbbell body. Whenthe lock plate is inserted into the indexing plate, the handle, bellplate and bell box will not move randomly, and the bell plate can besafely fixed on the handle, and the operation process is safe andreliable, and the failure rate is low;

3. The invention automatically selects different weights by rotating thehandle to different angles, and does not need to manually dismantle andadd the counterweight bell plate, which is convenient to operate andeasy to control;

4. The invention clearly and intuitively displays the weight of dumbbelland effectively controls the weight balance of both sides through theadjustment of the steel ball on the indexing plate and the text mark ofthe gear piece;

5. The invention is only connected with various parts through thecentral axis, with few accessories, simple structure and easy assembly;

6. The invention does not need to buy and replace bell pieces ofdifferent weights continuously, thus reducing the cost.

DESCRIPTION OF FIGURES

The invention is further described in combination with the drawings andthe embodiments.

FIG. 1 is the structural diagram of the lock piece unlocking state whenthe dumbbell body is placed on the base;

FIG. 2 is a structural diagram of the base of the present invention;

FIG. 3 is a structural diagram of the central shaft of the presentinvention;

FIG. 4 is a structural diagram of the shift piece of the presentinvention;

FIG. 5 is a structural diagram of the handle sleeve of the presentinvention;

FIG. 6 is a structural diagram of the bell piece of the presentinvention;

FIG. 7 is a structural diagram of the dividing disc of the presentinvention;

FIG. 8 is a structural diagram of the bell box cover of the presentinvention;

FIG. 9 is a structural diagram of the bell box of the present invention;

FIG. 10 is a structural diagram of the state of the dumbbell when thedumbbell body is detached from the base

FIG. 11 is a structural diagram of the dumbbell body when it is usedwithout the base.

In the above figures: 1. Base; 2. Handle; 3. Bell piece; 4. Bell piecegroove; 5. Unlocking device; 6. Central shaft; 7. Handle sleeve; 8. Snapspring groove; 9. Gear step; 10. Dividing disc; 11. Gear piece; 4.Locking device; 12. Bell box; 13, bell box cover; 14, lock positioningslot; 15, ball position hole; 16, lock spring; 17, lock plate; 18, ballspring; 19, ball; 20, gear identification; 21, bell slot isolation wall;22, starting gear; 23, bell positioning port; 24, bell control hole; 25,bell box isolation wall; 26, bell box semicircular hole; 27. Dividingplate limit hole; 28. Gear plate limit hole; 29. Baffle.

MODE OF CARRYING OUT THE INVENTION

The technical scheme of the present invention will be described indetail by means of embodiments with reference to the drawings. It shouldbe noted here that the description of these embodiments is used to helpunderstand the invention, but does not constitute a limitation of theinvention.

Example 1

The embodiment mainly introduces the main structure of the invention.

As shown in FIG. 1 , it shows the structure of the lock piece unlockingstate when the dumbbell body is placed on the base. An adjustabledumbbell comprises a base 1 and a dumbbell body. The base 1 is providedwith a bell piece groove 4 and an unlocking device 5. The dumbbell bodycomprises a handle 2 and a bell piece 3. The handle 2 is a combinationof a central shaft 6 and a handle sleeve 7. The ends on both sides ofthe central shaft 6 are provided with a snap spring groove 8 and a gearstep 9 from the outside to the inside. The central shaft 6 is alsoconnected with an indexing plate 10, a gear piece 11 and a bell piecebox 12 The dividing disc 10 is provided with a locking piece positioninggroove 14 and a steel ball shift hole 15, the bell box 12 is connectedwith a bell box cover 13, the bell box cover 13 is connected with alocking piece spring 16 and a steel ball spring 18, the locking piecespring 16 is connected with a locking piece 17, the locking piece 17 isconnected with a steel pin, the steel ball spring 18 is connected with asteel ball 19, and the shift piece is provided with a gear mark 20, Thebell box 12 is provided with a partition wall 25, and the bell box cover13 is connected with a baffle 29.

As shown in FIG. 2 , it shows the structure of the base 1 of the presentinvention. The base 1 contains a bell slot 4 and an unlocking device 5.The middle of the bell slot 4 is provided with a partition wall 21 withthe same distance, so that each bell 3 is placed at the same distance.When the bell 3 is placed naturally, it can stay at the same verticalangle and the opening direction is the same without adjustment. Theunlocking device 5 is located at the same position On both sides of thebase 1, the unlocking device 5 is a right angle trapezoid with an upperbottom on the side near the center of the base 1.

As shown in FIG. 4 , it shows the structure of the stop plate 11 of thepresent invention. The stop plate 11 is circular, and the positioningstructure with the central shaft 6 is a large semicircle stop hole 27 inthe center of the stop plate 11, and the surface of the stop plate 11contains a stop mark 20.

As shown in FIG. 5 , it shows the structure of the handlebar sleeve 7 ofthe invention. The handlebar sleeve 7 can be directly die cast on thecentral shaft 6, or the prepared cylinder with a large semicircular holein the center can be sheathed on the central shaft 6 to prevent thehandlebar sleeve 7 from sliding with the central shaft 6.

As shown in FIG. 6 , it shows the structure of the bell piece 3 of thepresent invention. The bell piece 3 is a large semicircle with a flatbottom, and the internal control semicircle hole 24 is located at theintersection of the positioning opening 23 and the bell piece center.

As shown in FIG. 7 , it shows the structure of the indexing disc 10 ofthe present invention. The indexing disc 10 is a circular plate with anotch, in which the radius of one part of the circle is slightly largerthan that of the other parts. It is connected with the central shaft 6through a snap ring groove 8 and a large semicircle indexing disc limithole 27 in the center of the indexing disc 10. The locking platepositioning groove 14 is a groove distributed on the periphery of theindexing disc 10, and the steel ball shift hole 15 is a round holeevenly distributed on the inner side of the dividing disc.

As shown in FIG. 8 , it shows the structure of the bell box cover 13 ofthe present invention. The bell box cover is a cylinder, which containsa plurality of holes for fixing and placing the lock spring 16, the lock17, and the ball spring 18. The collar box cover is also provided with abaffle 29, which is connected with the central shaft 6 through a snapspring groove 8.

As shown in FIG. 9 , it shows the structure of the bell box 12 of thepresent invention. The bell box 12 is an elliptic cylinder, and isequipped with a bell box partition wall 25 for fixing the bell pieceswith equal distance. One side of the elliptic column contains a bell boxsemicircular hole 26.

The embodiment has simple structure, only connects with each partthrough the central shaft, has less accessories, simple structure, andis easy to assemble, which makes it very easy for the user to select theweight of the dumbbell.

Example 2

The embodiment is carried out on the basis of the above embodiment 1,and mainly introduces the unlocking device of the invention.

The same points as those in embodiment 1 will not be repeated.

Furthermore, as shown in FIG. 1 , the preferred embodiment of thepresent invention shows the structure of the lock piece unlocking statewhen the dumbbell body is placed on the base. When the dumbbell body isplaced on the base 1, the unlocking device 5 applies force to thelocking spring 16 to push the locking plate 17 to separate the lockingplate 17 from the locking plate positioning groove 14. At this time, theunlocking device 5 is in the unlocking state, and the handle 2 canrotate to select the gear.

Furthermore, as shown in FIG. 2 , it shows the structure of the base 1of this embodiment. The base 1 contains a bell slot 4 and an unlockingdevice 5. The unlocking device 5 is located on both sides of the base 1,and the unlocking device 5 is a right angle trapezoid with an upperbottom on the side near the center of the base 1.

Furthermore, as shown in FIG. 7 , it shows the structure of the indexingplate 10 of this embodiment. The locking plate positioning groove 14 onthe indexing plate 10 is a groove evenly distributed on the periphery ofthe large semicircle of the smaller radius part of the indexing plate10; the number of the locking plate positioning groove 14 is n+1,including a starting gear 22, and the heights of the two sides of thestarting gear 22 and the maximum gear are inconsistent, which has thepositioning function.

Furthermore, as shown in FIG. 10 , when the dumbbell body leaves thebase 1, the thrust on the lock plate 17 disappears and it is insertedinto the lock plate positioning groove 14 of the indexing disc 10 tolock the rotation of the handle 2, so as to prevent the lock plate fromsliding and causing injury.

In this embodiment, the unlocking device is used to increase the thrustto the lock spring to realize the locking and unlocking of the dumbbellbody, which is simple in structure, convenient and fast; the lock plateis used to control the rotation of the dumbbell body, when the lockplate is inserted into the dividing plate, the handle, the bell plateand the bell plate box will not move at will, the bell plate can besafely fixed on the handle, and the use process is safe and reliable,with low failure rate.

When the dumbbell body is placed on the base 1, the unlocking device 5applies force to the locking spring 16 to push the locking plate 17 toseparate the locking plate 17 from the locking plate positioning groove14. At this time, the unlocking device 5 is in the unlocking state, andthe handle 2 can rotate to select a gear; when the handle 2 rotates, thesteel ball spring 18 can press the steel ball 19 to rotate on theindexing plate 10, and The steel ball 19 can fall into the steel ballgear hole 15, which can realize the function of adjusting gear andlocking; when the handle 2 rotates, the gear plate 11 will synchronouslyrotate to the required gear mark 20; when the dumbbell body leaves thebase 1, the thrust of the lock plate 17 disappears and is inserted intothe lock plate positioning slot 14 of the indexing disc 10, which locksthe rotation of the handle 2.

Example 3

The embodiment is carried out on the basis of embodiment 1 or 2, andmainly introduces the gear adjusting device of the invention.

The same as the above embodiments will not be described in detail.

Furthermore, as shown in FIG. 3 , it shows the structure of the centralshaft 6 of this embodiment. The central shaft 6 is rod-shaped, and itscross section is large semicircle, that is, the circle is cut off. Theends of both sides of the central shaft 6 are provided with a snap ringgroove 8 and a gear step 9 from the outside to the inside. The gear step9 includes N steps, n is a natural number greater than or equal to 2,and N steps are on the central shaft 6 The notch depth of the first stepis the shallowest and deepens in turn, and the N steps are arrangedclockwise or anticlockwise in turn. The starting position of the N stepson the outer side of the central axis 6 is the same, and the length ofthe first step is the longest and shortens in turn in the middledirection of the central axis 6.

Furthermore, as shown in FIG. 6 , it shows the structure of the bellpiece 3 of this embodiment. The bell piece 3 is a large semicircle witha flat bottom, and the internal control semicircle hole 24 is located atthe intersection of the positioning intersection 23 and the bell piececenter.

Furthermore, as shown in FIG. 7 , it shows the structure of the indexingdisc 10 of this embodiment. The number of large semicircles on thesmaller part of the radius of the ball shift hole 15 on the indexingdisc 10 is equal to the number of steps with different rotation angleson the shift step 9, and the ball shift hole 15 corresponds to the shiftstep 9 one by one. When the handle 2 rotates, the ball spring 18 canpress the ball 19, The steel ball 19 can fall into the steel ball shifthole 15 and realize the function of adjusting and locking.

Furthermore, as shown in FIG. 9 , it shows the structure of the bell box12 of this embodiment. The bell box 12 is an elliptic cylinder, and isequipped with a bell box partition wall 25 for fixing the bell pieceswith equal distance. One side of the elliptic column contains a bell boxsemicircle hole 26, and the bell box semicircle hole 26 and the bellcontrol semicircle 24 can be connected through the gear step 9.

In this embodiment, different weights are automatically selected byrotating the handle to different gear steps, and it is convenient tooperate and easy to control without manually removing and adding thecounterweight bell piece.

Example 4

This embodiment is based on any one or any combination of embodiments1-3, and mainly introduces the weight display device of the invention.The same as the above embodiments will not be described in detail.

Furthermore, as shown in FIG. 4 , it shows the structure of the shiftplate 11 of this embodiment, the shift plate 11 is circular, and thepositioning structure of the central shaft 6 is the large semicircleshift plate limit hole 27 in the center of the shift plate 11, and theshift plate 11 surface contains the shift mark 20; the shift mark 20 isa number, which is consistent with the number of the lock platepositioning slots 14 of the indexing disc 10, except for the minimumshift mark 20 When the handle 2 rotates, it will synchronously rotate tothe required gear mark 20.

Further, the gear identification 20 can be hidden, and only onecorresponding weight gear mark 20 is displayed each time the weight isadjusted.

Further, as shown in FIG. 11 , it shows the structure of the dumbbellbody in the embodiment when it is used when it is separated from thebase. The gear plate can directly display the weight of the bell plateson both sides after the dumbbell adjustment.

The embodiment shows the weight of dumbbell clearly and intuitively bymatching the gear adjustment of the steel ball on the indexing platewith the text mark of the gear piece, and effectively controls theweight balance of both sides.

The invention has been explained through the above embodiments, but itshould be understood that the above embodiments are only used for thepurposes of examples and explanations, rather than intended to limit theinvention to the scope of the described embodiments. For those skilledin the art, the invention can have various changes and changes,including the combination and reorganization of technical features. Anymodification, equivalent replacement, improvement, etc. made within thespirit and principle of the invention shall be included in the scope ofprotection of the invention.

1. An adjustable dumbbell comprises a base (1) and a dumbbell body,wherein the dumbbell body comprises a handle (2) and a bell piece (3),the handle (2) is a combination of a central shaft (6) and a handlesleeve (7), the handle (2) is also connected with an indexing plate(10), a shift piece (11) and a bell piece box (12), and the ends of bothsides of the central shaft (6) are arranged from the outside to theinside The dividing disc (10) is provided with a locking piecepositioning groove (14) and a steel ball position hole (15), the bellbox (12) is connected with a bell box cover (13), the bell box cover(13) is connected with a locking piece spring (16) and a steel ballspring (18), the locking piece spring (16) is connected with a lockingpiece (17), and the locking piece (17) is connected with a locking piece(17) A steel pin is connected with the ball spring (18), and a steelball (19) is connected with the ball spring (18).
 2. The adjustabledumbbell according to claim 1, wherein the base (1) is provided with abell slot (4) and an unlocking device (5), the middle of the bell slot(4) is provided with a partition wall (21) with the same distance, andthe unlocking device (5) is a right angle trapezoid with an upper bottomon the side near the center of the base (1).
 3. The adjustable dumbbellaccording to claim 1, wherein the handle sleeve (7) is a hollow cylinderwith a large semicircle hole in the center, the central shaft (6) isrod-shaped, and its cross section is large semicircle, that is, thecircle is cut off, and the snap ring groove (8) is a circle ofdepression on the central shaft (6).
 4. The adjustable dumbbellaccording to claim 1, wherein the gear step (9) comprises N steps, allof which are notches on the central axis (6), the notch depth of thefirst step is the shallowest, which is deepened in turn, and the N stepsare arranged clockwise or counterclockwise in turn, and the startingposition of the N steps on the outer side of the central axis (6) is thesame, which is on the central axis (6) In the middle direction, thelength of the first step is the longest, which is shortened in turn. 5.The adjustable dumbbell according to claim 1, wherein the dividing disc(10) is a circular plate with a notch, in which the radius of one partof the circle is slightly larger than that of the other parts, and isconnected with the central shaft (6) through a snap ring groove (8) anda large semicircle dividing disc limiting hole (27) in the center of thedividing disc (10), and the locking plate positioning groove (14) is theradius of the dividing disc (10) The steel ball shift hole (15) is acircular hole evenly distributed on the inner side of the dividing disc(10); the number of locking plate positioning slots (14) is n+1,including a start gear (22), the height of the start gear (22) is notconsistent with the maximum gear, which has positioning function; thesteel ball shift hole (15) is located in a small radius The number oflarge semicircles is equal to the number of steps with differentrotation angles on the shift step (9), and the ball shift hole (15)corresponds to the shift step (9) one by one.
 6. The adjustable dumbbellaccording to claim 1, wherein the gear plate (11) is a circle, and thepositioning structure of the central shaft (6) is a large semicircletype gear plate limiting hole (27) in the center of the gear plate (11),the surface of the gear plate (11) contains a gear mark (20), and thegear mark (20) is a number, which is the same number as the lock platepositioning groove (14) of the indexing disc (10) In addition to theminimum gear mark (20), the gear mark (20) is one-to-one correspondingto the gear step; the gear mark (20) can be hidden, and only onecorresponding weight gear mark (20) is displayed each time the weight isadjusted.
 7. The adjustable dumbbell according to claim 1, wherein thebell piece (3) is a large semicircle with a flat bottom, and theinternal control semicircle hole (24) is located at the intersection ofthe positioning opening (23) and the center of the bell piece.
 8. Theadjustable dumbbell according to claim 1, wherein the dumbbell box (12)is an elliptic cylinder, and is provided with a partition wall (25) forfixing the dumbbell pieces at an equal distance. One side of theelliptic column is provided with a semicircular hole (26) of thedumbbell box, and the semicircular hole (26) of the dumbbell box and thecontrol semicircle (24) of the dumbbell pieces can be connected throughthe gear step (9).
 9. The adjustable dumbbell according to claim 1,wherein the bell box cover (13) is a cylinder, and there are a pluralityof holes connecting the locking leaf spring (16), the steel ball spring(18) and the locking leaf (17) inside, and a baffle (29) is alsoarranged on the leading leaf box cover (13), and the baffle (29) isconnected with the central shaft (6) through a snap spring groove (8).10. The method for using the adjustable dumbbell according to claim 1,wherein: when the dumbbell body is placed on the base (1), the unlockingdevice (5) applies a force to the locking leaf spring (16) to push thelocking leaf (17) to separate the locking leaf (17) from the lockingleaf positioning groove (14), at this time, the unlocking device (5) isin the unlocking state, and the handle (2) can rotate to select a gear;and When the handle (2) rotates, the steel ball spring (18) can pressthe steel ball (19) to rotate on the dividing disc (10), the steel ball(19) can fall into the steel ball shift hole (15), and the functions ofadjusting and locking can be realized; when the handle (2) rotates, theshift plate (11) will synchronously rotate to the required shift mark(20); the dumbbell body leaves the base (1) At the same time, the thruston the lock plate (17) disappears and is inserted into the lock platepositioning groove (14) of the dividing disc (10) to lock the rotationof the handle (2).
 11. The method for using the adjustable dumbbellaccording to claim 2, wherein: when the dumbbell body is placed on thebase (1), the unlocking device (5) applies a force to the locking leafspring (16) to push the locking leaf (17) to separate the locking leaf(17) from the locking leaf positioning groove (14), at this time, theunlocking device (5) is in the unlocking state, and the handle (2) canrotate to select a gear; and When the handle (2) rotates, the steel ballspring (18) can press the steel ball (19) to rotate on the dividing disc(10), the steel ball (19) can fall into the steel ball shift hole (15),and the functions of adjusting and locking can be realized; when thehandle (2) rotates, the shift plate (11) will synchronously rotate tothe required shift mark (20); the dumbbell body leaves the base (1) Atthe same time, the thrust on the lock plate (17) disappears and isinserted into the lock plate positioning groove (14) of the dividingdisc (10) to lock the rotation of the handle (2).
 12. The method forusing the adjustable dumbbell according to claim 3, wherein: when thedumbbell body is placed on the base (1), the unlocking device (5)applies a force to the locking leaf spring (16) to push the locking leaf(17) to separate the locking leaf (17) from the locking leaf positioninggroove (14), at this time, the unlocking device (5) is in the unlockingstate, and the handle (2) can rotate to select a gear; and When thehandle (2) rotates, the steel ball spring (18) can press the steel ball(19) to rotate on the dividing disc (10), the steel ball (19) can fallinto the steel ball shift hole (15), and the functions of adjusting andlocking can be realized; when the handle (2) rotates, the shift plate(11) will synchronously rotate to the required shift mark (20); thedumbbell body leaves the base (1) At the same time, the thrust on thelock plate (17) disappears and is inserted into the lock platepositioning groove (14) of the dividing disc (10) to lock the rotationof the handle (2).
 13. The method for using the adjustable dumbbellaccording to claim 4, wherein: when the dumbbell body is placed on thebase (1), the unlocking device (5) applies a force to the locking leafspring (16) to push the locking leaf (17) to separate the locking leaf(17) from the locking leaf positioning groove (14), at this time, theunlocking device (5) is in the unlocking state, and the handle (2) canrotate to select a gear; and When the handle (2) rotates, the steel ballspring (18) can press the steel ball (19) to rotate on the dividing disc(10), the steel ball (19) can fall into the steel ball shift hole (15),and the functions of adjusting and locking can be realized; when thehandle (2) rotates, the shift plate (11) will synchronously rotate tothe required shift mark (20); the dumbbell body leaves the base (1) Atthe same time, the thrust on the lock plate (17) disappears and isinserted into the lock plate positioning groove (14) of the dividingdisc (10) to lock the rotation of the handle (2).
 14. The method forusing the adjustable dumbbell according to claim 5, wherein: when thedumbbell body is placed on the base (1), the unlocking device (5)applies a force to the locking leaf spring (16) to push the locking leaf(17) to separate the locking leaf (17) from the locking leaf positioninggroove (14), at this time, the unlocking device (5) is in the unlockingstate, and the handle (2) can rotate to select a gear; and When thehandle (2) rotates, the steel ball spring (18) can press the steel ball(19) to rotate on the dividing disc (10), the steel ball (19) can fallinto the steel ball shift hole (15), and the functions of adjusting andlocking can be realized; when the handle (2) rotates, the shift plate(11) will synchronously rotate to the required shift mark (20); thedumbbell body leaves the base (1) At the same time, the thrust on thelock plate (17) disappears and is inserted into the lock platepositioning groove (14) of the dividing disc (10) to lock the rotationof the handle (2).
 15. The method for using the adjustable dumbbellaccording to claim 6, wherein: when the dumbbell body is placed on thebase (1), the unlocking device (5) applies a force to the locking leafspring (16) to push the locking leaf (17) to separate the locking leaf(17) from the locking leaf positioning groove (14), at this time, theunlocking device (5) is in the unlocking state, and the handle (2) canrotate to select a gear; and When the handle (2) rotates, the steel ballspring (18) can press the steel ball (19) to rotate on the dividing disc(10), the steel ball (19) can fall into the steel ball shift hole (15),and the functions of adjusting and locking can be realized; when thehandle (2) rotates, the shift plate (11) will synchronously rotate tothe required shift mark (20); the dumbbell body leaves the base (1) Atthe same time, the thrust on the lock plate (17) disappears and isinserted into the lock plate positioning groove (14) of the dividingdisc (10) to lock the rotation of the handle (2).
 16. The method forusing the adjustable dumbbell according to claim 7, wherein: when thedumbbell body is placed on the base (1), the unlocking device (5)applies a force to the locking leaf spring (16) to push the locking leaf(17) to separate the locking leaf (17) from the locking leaf positioninggroove (14), at this time, the unlocking device (5) is in the unlockingstate, and the handle (2) can rotate to select a gear; and When thehandle (2) rotates, the steel ball spring (18) can press the steel ball(19) to rotate on the dividing disc (10), the steel ball (19) can fallinto the steel ball shift hole (15), and the functions of adjusting andlocking can be realized; when the handle (2) rotates, the shift plate(11) will synchronously rotate to the required shift mark (20); thedumbbell body leaves the base (1) At the same time, the thrust on thelock plate (17) disappears and is inserted into the lock platepositioning groove (14) of the dividing disc (10) to lock the rotationof the handle (2).
 17. The method for using the adjustable dumbbellaccording to claim 8, wherein: when the dumbbell body is placed on thebase (1), the unlocking device (5) applies a force to the locking leafspring (16) to push the locking leaf (17) to separate the locking leaf(17) from the locking leaf positioning groove (14), at this time, theunlocking device (5) is in the unlocking state, and the handle (2) canrotate to select a gear; and When the handle (2) rotates, the steel ballspring (18) can press the steel ball (19) to rotate on the dividing disc(10), the steel ball (19) can fall into the steel ball shift hole (15),and the functions of adjusting and locking can be realized; when thehandle (2) rotates, the shift plate (11) will synchronously rotate tothe required shift mark (20); the dumbbell body leaves the base (1) Atthe same time, the thrust on the lock plate (17) disappears and isinserted into the lock plate positioning groove (14) of the dividingdisc (10) to lock the rotation of the handle (2).
 18. The method forusing the adjustable dumbbell according to claim 9, wherein: when thedumbbell body is placed on the base (1), the unlocking device (5)applies a force to the locking leaf spring (16) to push the locking leaf(17) to separate the locking leaf (17) from the locking leaf positioninggroove (14), at this time, the unlocking device (5) is in the unlockingstate, and the handle (2) can rotate to select a gear; and When thehandle (2) rotates, the steel ball spring (18) can press the steel ball(19) to rotate on the dividing disc (10), the steel ball (19) can fallinto the steel ball shift hole (15), and the functions of adjusting andlocking can be realized; when the handle (2) rotates, the shift plate(11) will synchronously rotate to the required shift mark (20); thedumbbell body leaves the base (1) At the same time, the thrust on thelock plate (17) disappears and is inserted into the lock platepositioning groove (14) of the dividing disc (10) to lock the rotationof the handle (2).